St Columb's College (Irish: Coláiste Naomh Colum Cille) is a Roman Catholic boys' grammar school in Derry, Northern Ireland and, since 2008, a specialist school in mathematics. It is named after Saint Columba, the missionary monk from County Donegal who founded a monastery in the area. The college was originally built to educate young men into the priesthood, but now educates boys in a variety of disciplines. St Columb's College was established in 1879 on Bishop Street (now the site of Lumen Christi College), but later moved to Buncrana Road in the suburbs of the city.